One partial solution to this problem may be conversion of phosphogypsum to ammonium sulfate by the so-called Merseberg ammonocarbonation process. Ammonium sulfate is an excellent fertilizer which supplies sulfur as well as nitrogen to soils. ... The trial production results from demonstration plant for production of ammonium sulfate …
The research progress of comprehensive utilization of phosphogypsum is introduced, including the production of sulfuric acid, calcium sulfate whiskers, potassium sulfate, ammonium sulfate, paper filler and coating pigment, building materials and products, nano-hydroxyapatite, as soil amendments, fertilizer, subgrade material, filling …
Phosphogypsum is the byproduct discharged from phosphate industry. A novel process was proposed for converting phosphogypsum into ammonium sulfate via phosphogypsum carbonation with ammonia. The effects of stirring speed, reaction time, initial temperature, CO 2 partial pressure, liquid–solid ratio and excess ammonia ratio …
To reduce the energy consumption for (NH 4) 2 SO 4 fertilizer production, the ammonium sulfate concentration obtained after the flash separation section is …
Although an ammonium sulphate production is foreseen with the evaluation of carbon dioxide and phosphogypsum waste with the Merseburg process, the effect of the impurity content of the waste ...
Phosphogypsum is the primary waste byproduct of the wet-acid process for producing phosphoric acid. During this process sulfuric acid dissolves phosphate rock creating a solid/liquid mixture (slurry) of …
A well-known and extensively used production process (Vis, 1915; Witte and Wit, 1972) for ammonium sulfate [(NH. 4) 2. SO. 4, AS] utilizes calcium sulfate as a raw material (Eq. 1): CaSO 2H Os NH ...
Phosphogypsum (PG), commonly known as calcium sulfate, is a waste by-product generated during the production of phosphoric acid by the wet phosphoric acid process (WPA).
Abstract This study presents an efficient and sustainable procedure for converting phosphogypsum (PG) waste, along with hydrofluoric acid (HF) and ammonia (NH3), into valuable materials. The results obtained demonstrate the high efficiency of this proposed procedure, resulting in the synthesis of relatively pure calcium fluoride (CaF2) …
The optimum process temp. was 50°C, the phosphogypsum:(NH4)2CO3 ratio 1:2.5 and concn. of (NH4)2CO3 14%. ... with ammonium sulfate solution at above 70 oC. This work presents a cleaner and ...
All results showed that phosphogypsum waste can successfully be used to produce nano-size HAP crystals and ammonium sulfate [36]. Rod-like nano-powder of hydroxyapatite was previously synthesized ...
In enhanced phosphogypsum carbonation, water is used as a solvent for dissolving the ammonia, producing the ammonium sulfate, and dissociating phosphogypsum with a fast carbonation reaction rate. Using more water in the process will decrease the obtained ammonium sulfate concentration.
Urease-producing L. sphaericus strain GUMP2 could be used to remove the hazardous phosphogypsum from the environment by converting it to the industrially useful CaCO 3 and ammonium sulfate, a valuable agricultural fertilizer. This novel and sustainable approach could be a promising solution for the hazardous phosphogypsum in the …
Ammono-carbonation reaction of any kind of gypsum (pure, PG or FGD gypsum) with ammonium carbonate known as Merseburg Process is used to produce ammonium sulfate and calcium carbonate.
Phosphogypsum (PG) is an industrial byproduct primarily composed of calcium sulfate dihydrate (DH, CaSO 4 ·2H 2 O), generated from the wet process production of phosphoric acid. Currently, the ...
In this production process, potassium sulfate is produced by react- ing ammonium sulfate and potassium chloride at a temperature of about 30 to 40 °C to produce a slurry containing
A new preparing process for K 2SO 4 from (NH 4) 2SO 4 was developed. The effects of the raw material mole ratio, reaction temperature,crystal temperature, time and crystal improver on the comversion of the raw material and the compoisition of products were studied through orthogonal experiment and individual experiments. Meanwhile, the optimal …
Ammonium sulfate is also used in preparation of other ammonium salts and food additive. In biochemistry its precipitation is a common method for purifying proteins [17]. So, the present work aims to use the phosphogypsum waste for preparing both hydroxyapatite nano-crystalline powder and ammonium sulfate at room temperature.
The obtained precipitate is the highly purified phosphogypsum which is used to obtain the highly purified ammonium sulfate fertilizer, the preparation of ammonium sulfate process is applied using the suspended of 500 g purified phosphogypsum which is contained 410.6 g calcium sulfate in 2 L of 3% ammonium sulfate solution (as …
Phosphogypsum Two-Step Ammonia-Carbonation Resulting in Ammonium Sulfate and Calcium Carbonate Synthesis: Effect of the Molar Ratio OH−/Ca2+ on the …
Phosphogypsum Two-Step Ammonia-Carbonation Resulting in Ammonium Sulfate and Calcium Carbonate Synthesis: Effect of the Molar Ratio …
Phosphogypsum (CaSO4·2H2O) waste is produced in large amounts during phosphoric acid (H3PO4) production. Minor quantities are utilized in construction or agriculture, while most of the material is stockpiled, creating an environmental challenge to prevent pollution of natural waters. In principle, the gypsum waste could be used to capture several …
One partial solution to this problem may be conversion of phosphogypsum to ammonium sulfate by the so-called Merseberg ammonocarbonation process. Ammonium sulfate is an excellent fertilizer which supplies sulfur as well as nitrogen to soils. ... (CaO) and recycle the liberated CO2 back into the Merseberg process for production of the …
Semantic Scholar extracted view of "Ammonium sulfate preparation from phosphogypsum waste" by A. Kandil et al. ... {Ammonium sulfate preparation from phosphogypsum waste}, author={Abdelhakim Kandil and Mohamed F. Cheira and Hady S. Gado and Madiha H. Soliman and Hesham M. Akl}, journal={Journal of Radiation …
The Egyptian phosphogypsum waste is treated using sulfuric acid prior the ammonium sulfate production. The relevant factors that would affect the removal efficiencies of some impurities are...
The aim of this process is to produce potassium sulfate, a high-value fertilizer, from sulfate solutions obtained after dissolving Moroccan phosphogypsum in NaOH medium.
Phosphogypsum (PG) waste is a by-product generated from wet-process phosphoric acid (H 3 PO 4) manufacturing during phosphate rock decomposition.Worldwide, the annual production of PG ranges between 100 and 300 million tons, with only a few quantities utilized in several application domains (about …
Stoichiometrically, for every 1.0 tonne of ammonium sulphate produced, 0.9 tonnes of PCC is also produced and 1.6 tonnes of gypsum and 0.4 tonnes CO 2 are consumed. South Africa has an opportunity to sequestrate up to 0.2 % of its CO 2 emission and 100 % of its phosphogypsum generation through the Merseburg. Chou et al. are …
We describe herein a detailed study on the effect of molar ratio MR = n(OH⁻)/n(Ca²⁺) on the Phosphogypsum (PG) waste ammonia-carbonation process.
